EE599: Applied Controls (Spring 2001)
PROJECT DESCRIPTION (Description of problem)
PLEASE NOTE THE CORRECTIONS (April25):
CCWsense and CWsense have been swapped (corrected)
Address for RedLamp has been corrected.
RedLamp
(paint)
CCWsense
Conveyor
GreenLamp
CWsense
PE1
PE2
You will design the controller for a paint system. The system has a conveyor that takes
parts to a paint robot. The robot sweeps over the part, before the part then moves on.
The system has the following inputs and outputs:
Inputs:
I:3/0
I:3/1
I:3/2
I:3/3
I:3/4
“On” switch
Arm Clockwise position sense (CW sense)
Arm Counterclockwise sense (CCW sense)
Conveyor sensor 1 (PE1 = photoeye 1) –ACTIVE LOW!
Conveyor sensor 2 (PE2 = photoeye 2) – ACTIVE LOW!
Outputs:
O:1/0 Powersupply (this will be explained more later)
O:2/0
O:2/1
O:2/2
O:2/3
O:2/4
O:2/5
Sensor lamps (across conveyor from PE1 and PE2)
Conveyor motor
Arm motor direction (high is clockwise)
Arm motor power
Green lamp
Red lamp (paint spray is active)
Control requirements:
Your program must first turn on power (O:1/0).
The sensor lamps must be on for the conveyor sensors to work. You should turn on these
sensor lamps only while the “On” switch is on. (All actuators and lamps should be off
when the switch is off.)
When the “On” switch is turned on, the conveyor should start. It should run until PE1
indicates the presence of a part at the paint station. At this point, the conveyor should
turn off. The paint arm, which is assumed to have started in its CCW position, should be
moved to the CW position, and then back to the CCW position. While the arm moves,
the paint should be spraying (represented by the Red lamp being on).
After a complete spray operation, the Red lamp should be off. The green light should
turn on and stay on for 2 seconds, indicating the process is complete. The conveyor
should then turn on again. The system should be ready to receive another part.
(Note that we do not use PE2 in this example.)
ASSIGNMENT:
You must write and demonstrate a control program on the PLC. This program must
satisfy the above requirements. You must hand in the following:
1) a printout of your program.
2) A description of your program logic, including the state machine that you
used.
3) You must demonstrate your program to Dr. Holloway.
All this must be done by Tuesday, 5/01/01, by 4:30pm. (Note that your final exam time
is 8:00am on Tuesday, but you have until 4:30pm to complete the project.)